Nature of problem:The program calculates angular distributions produced by direct nuclear
transfer reactions. In this type of reaction one assumes that a nucleon
or cluster of nucleons is transferred directly from a bound state in th
e projectile nucleus to a bound state in the target nucleus.

Solution method:The angular distributions are calculated by using the Distorted-Wave-
Born-Approximation (DWBA) with the additional approximation of no-
recoil.
The method used here is that of Sawaguri and Tobocman. With this
method one uses harmonic oscillator functions to expand the final bound-
state wave function and to expand the initial bound-state wave function
times its corresponding potential. These expansions are then used to
generate a series expansion for the form factor or transfer function.
This transition function is then used to calculate the distorted partial
-wave matrix elements which are used to generate the angular
distribution.
Phase 1 calculates the form factor, or transfer function for each
possible transferred L-value for given single-particle levels in both
the initial and final bound states of the transferred particle. Other
sets of single-particle levels may be included by running Phase 1 as
many times as necessary. Phase 2 calculates the differential cross
section by using the transfer function from Phase 1 to evaluate the
matrix elements for each set of partial waves in the initial and final
channels. Only the optical-model parameters are variable in Phase 2
since the contribution of the bound states to the matrix elements is
fixed by Phase 1.

Restrictions:The restrictions due to the "no-recoil" approximation are discussed in
the theory section of the Long Write-up. The program is also
restricted to interactions (in both bound-state and optical-model
potentials) which have no spin dependence.